Clicking sound after starting.

I have a 2002 GMC Envoy SLE. I bought the truck new and am very happy with it except for a few flaws. The latest is when I start my car in the morning. Typically after sitting overnight, the engine starts and there are about 4 *click* noises. I'm not really sure what the problem could be, but it only seems to happen after the car has been off awhile. I have taken it to the dealer, but when I get there it doesn't make the noise. I am pretty sure that this problem will not destroy my car, but it shouldn't be happening in such a new vehicle. If anyone has any comments on the situation I would be very grateful. Thanks all.

Well now I have the same year and model as you do and I since day one I have had the clicking. The answer I recieved at Darcy GMC in Joliet is that its a characteristic of the inline six engine. Well now that tells me alot because I had a 1975 NOVA with an inline 6 and with 143k miles and it never clicked. LOL

The sound you are hearing is a dry-start. The clicking is valve noises before oil gets to the camshaft, but as soon as oil pressure rises all the parts get lubed and the sound goes away.

Hi. We have the same problem with our 2002 Envoy, I think. Our noise, though, is not coming from under the hood. It sounds like it is coming from the steering column or ignition. And, early on it only made the clicking noise just after starting. . . but now it will make it periodically while driving. Any ideas??

The noise you are hearing comes from the A/C unit in Dash its a faulty module that will run you a cool 500.00 repair bill as long as keeps cooling I can live with the clicks.

Buzz Buzz!!! You are most likely all incorrect!

The 4 clicks you are hearing is your clutch fan engaging/disengaging upon a cold start.

When you shut the truck off, the clutch fan was in a different operating mode (i.e. hot engine), and now your engine is cold. Seeing that the clutch does not function when the car is off, the next time you start up your GMC T360 with a clutch fan (namely the 4.2L I6 engine), the clutch fan must quickly adjust to "cold engine" mode.

Nice try though with the A/C getting ready to blow up. WTF? Oh, yeah, your engine will click just 4 times when its starved for oil upon startup! (LOL) Another good one to add to the list. You might as well have told the person it was the air in their tires! (rolling eyes) lol

I have both of those problems; the 4 clicks and the weird clicking type noise coming from the 'steering column'. i am positive it's connected to the ac or fan becuz i only hear it when i turn the knob controlling the position of airflow (i.e. feet, feet/face, face, defrost, etc.).

As for the 4 clicking noises after starting, i'm glad to see it's not serious. that has happened to me a total of three times. my question is, why doesn't it happen in the winter more often, being that the engine is constantly subject to warm/cold conditions? Also, the 3 times it happened was during the summer season. Can you elaborate on that Chriznat?

I have both of those problems; the 4 clicks and the weird clicking type noise coming from the 'steering column'. i am positive it's connected to the ac or fan becuz i only hear it when i turn the knob controlling the position of airflow (i.e. feet, feet/face, face, defrost, etc.).

The under-dash clicking would be a broken electric blend door actuator. Pretty common on the earlier trail-voy's. The actuators themselves are replaceable. Work the knob and listen for their location.

Joel

Has anyone found out any other possible reasons for the clicking after startup. I've been experiencing this more frequently these days and I'm curious to find out other explanations

thanx

This thread is pretty old and looks dead, I will answer this but to continue start a new thread. Where is the noise coming from, does it go away what triggers it?